【代码笔记】iOS-通过颜色来生成一个纯色图片

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.

UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];
imageView.backgroundColor=[UIColor yellowColor];
imageView.image=[self buttonImageFromColor:[UIColor redColor]];
[self.view addSubview:imageView];

}
//通过颜色来生成一个纯色图片
- (UIImage *)buttonImageFromColor:(UIColor *)color{

CGRect rect = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}